Paper-making machine



UNITED sTATEs PATENT OFFICE.

OBADIAH' MARLAND, OF BOSTON. MASSACHUSETTS.

PAPER-MAKING MACHINE.

Specification of Letters Patent No. 12,028, dated December 5, 1854.

To all whom t may concern Be it known that I, OBADIAH MARLAND, ofBoston, in the county of Suffolk and State of Massachusetts, haveinvented a new and useful Improvement in Cylinder-Paper Machines, ofwhich the following is a full, clear, and exact description, referencebeing had to the annexed drawings, making part of this specification, inwhich- Figure l is a plan of a Cylinder Machine with `my improvementattached, the felt ycloth and couch roll being removed t-o show theparts beneath. Fig. 2 a plan with certain other parts removed, Fig. 3 alongitudinal section through the machine, and Fig. 4L a view of 'one ofthe spiral conveyers' detached.

Wy invention has for its object the remedy-VN ing of the well knowndefects of cylinder made paper, by interlacing and interweaving thefibers of the pulp as they are'laidf ofspiral revolving conveyers,-in amanner which will now be described. y

A is 4the vat; B, the cylinder mold, which is constructed and operatedas in ordinary cylinder paper machines.

D is the couch roll; E, the felt cloth which passes over. the roll C,beneath the felt stretcher F, and over the carrier roll G. The paperleaves the cylinder at the point a.

H is a metallic shell which surrounds the cylinder mold within the vat;this'shell is divided into a number of compartments by the longitudinalpartitions c. These compartments are open at each end and alsocommunicate with the vat through numerous holes d, made through t-heexterior of the shell; in each of the compartments of the shell H is aspiral conveyer m, seen detached in Fig. 4, these conveyers are revolvedalternately in one direction and the other for the purpose of producingcurrents and counter currents of the pulp along the surface of thecylinder; the shafts of these conveyers pass through stufiingboxes inthe sides of the vat and carry .at their extremities, the pulleys faround which passes a cord from the driving pulley K,`the cord passingabove one pulley, and beneath the next through the series, by whichmeans the conveyers are rotated alternately in opposite directions asalready explained.

It is well known that the fibers of the pulp in an ordinary cylinderpaper machine, or al great majority of them, are laid longitudinally andparallel to each other by the uniform and uninterrupted motion of thecylinder in one direction. This disposition of the fibers causes thepaper, though strong in one direction, to be quite weak longitudinally.It is evident however that where the above described method is employedthe fibers first laid upon the cylinder will be inclined in onedirection by the first revolving conveyer; this layer is immediately.succeede-d by another, the fibers of which form a certain angle withthe first, this angle being dependent upon the relative velocities ofthe surface ofl the revolving cylinder mold, and of the current producedin the pulp by the revolving conveyers. These layers are again coveredby others, the fibers of each layer crossing those of the layer beneathit. An exceedingly firm texture is thus produced, and I am enabled tosecure all the advantages attendant upon the use of kboth cylinder andFourdrinier machines,

without their disadvantages.

Claim- Vhat I claim as my invention and 'desire to secure by LettersPatent is- Producing, within the vat of a cylinder paper making machine,currents and counter currents of the pulp, parallel or nearly so to theaxis of the cylinder, by the use of spiral conveyers operating withint-he partition shell H or by means of their mechanical equivalents asdescribed.

OBADIAH MARLAND.

Witnesses:

SAM. COOPER, JOHN S. CLow.

